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Diagnostic Functions Section 5-8
in the PLC properties and Window/PLC Memory Backup Status must be
selected from the View Menu. For normal transfer operations (PLC/Transfer),
the backup status will be displayed in the transfer window after the transfer
status for the program and other data. Never turn OFF the FQM1 power dur-
ing these backup operations. The flash memory will be corrupted if the power
is turned OFF.
Auxiliary Area Flags
5-8 Diagnostic Functions
This section provides a brief overview of the following diagnostic and debug-
ging functions.
• Error Log
• Failure Alarm Functions (FAL(006) and FALS(007))
5-8-1 Error Log
Each time that an error occurs, the Module stores error information in the
Error Log Area. The error information includes the error code (stored in A400)
and error contents. Up to 20 records can be stored in the Error Log.
In addition to system-generated errors, the Module records user-defined
FAL(006) and FALS(007) errors, making it easier to track the operating status
of the system.
Refer to SECTION 9 Error Processing for details.
Note A user-defined error is generated when FAL(006) or FALS(007) is executed in
the program. The input conditions of these instructions constitute the user-
defined error conditions. FAL(006) generates a non-fatal error and FALS(007)
generates a fatal error that stops program execution.
When more than 20 errors occur, the oldest error data (in A100 to A104) is
deleted, the remaining 19 records are shifted down by one record, and the
newest record is stored in A195 to A199.
Name Address Meaning
Flash Memory Error
Flag
A403.10 Turns ON when the flash memory is cor-
rupted.